$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1-vaapi.git /var/lib/mock/f39-build-1889221-42792/root/chroot_tmpdir/scmroot/gstreamer1-vaapi
Cloning into '/var/lib/mock/f39-build-1889221-42792/root/chroot_tmpdir/scmroot/gstreamer1-vaapi'...
$ git fetch origin e881d7e2fbb403df0483d39882d6eb4a54036dcf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1-vaapi
 * [new ref]         e881d7e2fbb403df0483d39882d6eb4a54036dcf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e881d7e 1.22.7